Half-Duplex UE Subframe Segmentation for Conflicted Carrier Aggregation
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Solution Overview
Problem
Half-duplex user equipment (UE) in radio communications systems cannot perform simultaneous reception and transmission, leading to inefficient resource utilization in scenarios with dynamic TDD carriers and carrier aggregation with different uplink-downlink configurations, resulting in conflicted subframes where the UE can only send or receive information on one carrier at a time.
Innovation Solution
The UE determines a first subframe and configures it to send a first uplink signal, where the uplink signal occupies a part of the subframe symbols, and detects a downlink control channel on non-overlapping symbols in the same subframe, allowing for separate uplink and downlink operations without simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation with different uplink-downlink configurations is used, then peak rate and service flexibility are improved, but resource utilization deteriorates due to conflicted subframes where half-duplex UE cannot simultaneously transmit and receive
Solution Approach 1:
The patent segments the subframe structure by introducing a partial uplink subframe where only certain resource blocks are allocated for uplink transmission while other resource blocks remain available for downlink reception. This segmentation allows the UE to partially engage in uplink transmission without completely blocking downlink reception, thereby resolving the resource utilization issue in conflicted subframes while maintaining the flexibility of different uplink-downlink configurations.
2Adaptability or versatility
If dynamic TDD carrier technology is introduced, then adaptability to service requirements is improved, but device complexity increases due to the need for dynamic subframe direction switching
Solution Approach 1:
The patent applies local quality by allowing different parts of the subframe (different resource blocks) to have different transmission directions. Instead of switching the entire subframe between uplink and downlink, only specific resource blocks are dynamically allocated for uplink while others maintain downlink functionality. This reduces the complexity of full subframe switching while maintaining adaptability to service requirements.
3Ease of operation
If half-duplex UE operates in conflicted subframes, then ease of operation is maintained, but productivity decreases due to inability to utilize both uplink and downlink resources simultaneously
Solution Approach 1:
The patent introduces a new dimension in resource allocation by moving from subframe-level uplink/downlink switching to resource block-level allocation within the same subframe. This dimensional change allows half-duplex UE to simultaneously transmit on certain resource blocks and receive on others within the same time frequency resources, effectively increasing productivity without complicating the operation for the UE.
Data Source
AI summary
Embodiments of the present invention provide an information transmission method, including: determining, by a user equipment (UE), a first subframe; configuring the UE to send a first uplink signal in the first subframe; determining, by the UE, that the first uplink signal is a first type of uplink signal, where the first type of uplink signal occupies a first part of symbols of the first subframe, and the number of symbols included in the first part of symbols is less than the number of symbols included in the first subframe; and detecting, by the UE, a downlink control channel on a second part of symbols in the first subframe, where the first part of symbols and the second part of symbols do not overlap in time domain.